324 New York State Museum 



rests upon progressively older (lower) beds. In central 

 and east central New York the basal bed is known as the 

 Oneida conglomerate (Vanuxem MO). It rests upon the 

 Upper Medina beds in Oswego county ; disappears west- 

 ward in Wayne county ; and in Otsego county the eastern 

 extension in the Mohawk valley rests upon the Frank- 

 fort shales. The excellent exposures in Oneida county 

 in the vicinity of the village of Verona gave it the name. 

 This conglomerate has a maximum thickness of 50 to 70 

 feet and carries the characteristic fossil, Arthrophycus 

 alleghaniensis, also found in the Thorold sandstone, which 

 is not, as commonly believed, an indication of Medinan 

 age but, on the contrary, always occurs in the initial de- 

 posit of the Clinton and not in the Medina beds beneath 

 the erosion contact. 



The Maplewood shale (Chadwick '18) named from 

 Maplewood Park, Rochester, is a green, unfossiliferou* 

 shale above the Thorold, with a thickness of 21 feet in 

 the Rochester section where it is best displayed. This 

 bed was formerly called the Sodus shale but has been 

 shown to be older (Chadwick). It pinches out about a 

 hundred miles or so east of Rochester, somewhere be- 

 tween Lakeport and Verona, Oneida county. Above the 

 Maplewood shale in the Rochester section is a tripartite 

 limestone about 18 feet thick, called the Reynales lime- 

 stone (Chadwick '19) from Reynales Basin, near Gas- 

 port, Niagara county. The lower four feet contain a 

 representation of the Furnaceville iron ore and are 

 known by their fossils as far west as Hamilton, Ontario. 

 This lower part is the typical Reynales limestone, con- 

 sisting of thin limestone and shale containing near the 

 top minute gastropods (Cyclora and Microceras) and 

 characterized in the upper half by a fair representation 



